Which of the following combination does not evolve `Cl_(2)` gas?

Options

A. `HCl(aq.)+KMnO_(4)`
B. `HCl+MnO_(2)`
C. `HCl+Br_(2)`
D. `HCl+F_(2)`

Explanation

To determine which combination does not evolve chlorine gas (Cl₂), we will analyze each of the given reactions step by step.

### Step 1: Analyze the reaction of HCl with KMnO₄
- **Reaction**: HCl (aq) + KMnO₄
- **Products**: KCl + MnCl₂ + H₂O + Cl₂
- **Observation**: Chlorine gas (Cl₂) is evolved in this reaction.

### Step 2: Analyze the reaction of HCl with MnO₂
- **Reaction**: HCl (aq) + MnO₂
- **Products**: MnCl₂ + H₂O + Cl₂
- **Observation**: Chlorine gas (Cl₂) is also evolved in this reaction.

### Step 3: Analyze the reaction of HCl with Br₂
- **Reaction**: HCl (aq) + Br₂
- **Observation**: There is no reaction because bromine (Br₂) is a weaker oxidizing agent than chlorine (Cl₂). Therefore, no chlorine gas is evolved in this case.

### Step 4: Analyze the reaction of HCl with F₂
- **Reaction**: HCl (aq) + F₂
- **Products**: HF + Cl₂
- **Observation**: Chlorine gas (Cl₂) is evolved in this reaction as fluorine (F₂) is a stronger oxidizing agent than chlorine.

### Conclusion
From the analysis, we find that the only reaction that does not evolve chlorine gas is the third one, where HCl reacts with Br₂.

### Final Answer
The combination that does not evolve Cl₂ gas is:
**HCl + Br₂**

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